300grn berger in a Cheytac?

Hey guys, I dont usually post over here but allways check in to see whos doing what. I am just wondering if anyone has pushed the 300 grain bergers in a 338-375 Cheytac or improved wildcat. I am about to put a few together and just wondering if I need to order some bullets before you guys buy them all? Mainly wondering if they hold up to the speed or fly apart? Thanks.